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John Connally, who ran the US Treasury under President Richard Nixon five decades ago, once opined to his international counterparts that “the dollar is our currency, but it’s your problem.” This year it’s been a bigger headache than usual. The mighty greenback surged against just about every other currency, driven by a combination of higher US interest rates, diverging economic prospects and a hunt by investors for safety. For some countries, that has meant the potential for faster inflation —